I plan to drain the tranny and replace filter and gasket. Car has 296K miles. Not sure if this is the orig fluid but I plan to change with Mobil synthetic ATF.

Is there any harm in using synthetic with this mileage on the tranny? (car shift a bit rough and am hoping this would smooth it out).

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the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth...
2007 Honda Accord EX
2007 Honda Accord SE V6
96 C220
97 Explorer - Found Another Home
2000 Honda Accord V6 - Found Another Home
85 300D - Found Another Home
84 300D - Found Another Home
80 300TD - Found Another Home
Previous cars:
96 Caravan
87 Camry
84 Cressida
82 Vanagon
80 Fiesta
78 Nova
Ford Cortina
Opel Kadet
68 Kombi
Contessa